What colour cap are you guys n girls using ?
My understanding is the black cap is rated at 11 psi and the green at 22 psi .
I'm soon going to change a few parts on the heating system including a new expansion tank , heater matrix and hoses. I've had a new black cap for a few years now without using it , and also have a new green one . I'd like to use the black one .
Anyone using the black one ?